Jaw keying means for chuck devices



Oct. 20, 1953 L. IRRGANG Filed NOV. 30, 1951 JAW KEYING MEANS FOR CHUCK DEVICES INVENTOR LOUIS IRRGANG ATTO R Y Patented Oct. 20, 1953 JAW KEYING MEANS FOR CHUCK DEVICES Louis Irrgang, Jersey City, N. J assignor to Ettco lool 00., Inc., Brooklyn, N. 1., a corporation of New York Application November 30, 1951, Serial No. 259,100

Claims. 1

This invention relates to chuck devices having means for retaining the tool keying jaws of the device against displacement and rotation in the chuck body. More particularly, the invention deals with a retaining means which is readily detachable from the chuck body and further provides a balanced chuck body. Still more particularly the invention includes means for balancing the tool keying jaws in said body.

The novel features of the invention will be best understood from the following description when taken together with the accompanying drawings in which certain embodiments of the invention are disclosed, and in which the separate parts are designated by suitable reference characters in each of the views, and in which:

Fig. 1 shows a side and sectional view of a chuck device made according to my invention with parts of the construction broken away and in section.

Fig. 2 is a, section on the line 22 of Fig. 1, omitting parts of the construction.

' In chuck devices of the kind under consideration it has been the common practice to employ key screws or key pins to retain the tool keying jaws against displacement and rotation in the body of the chuck. Structures of this type and kind have been expensive and further result in creating in the chuck body an unbalanced condition which in high speed operation of the chuck can result in producing undesirable vibratory movement.

It is the purpose of my invention .to provide a chuck device, first with a very simple and economical means of retaining the tool keying jaws against displacement from the chuck body as well as against rotation therein, and further a means which can be quickly attached and detached with respect to the body. Still further is the purpose of my invention to provide such a means which establishes a balanced condition of the chuck body, which balanced condition is further facilitated by providing, at opposed ends of the feed screw, similar key sockets so that the feed screw becomes also balanced in so far as distribution of weight is concerned within the chuck body.

In Fig. 1 of the drawing I have shown partly in side elevation and partly in section a drill chuck generally identified by the reference character I0. This chuck comprises a chuck body II on the reduced portion I2 of which is rotatably mounted the usual milled sleeve I3 for actuating the shank of a tool partly seen at M in Fig. 1.

The body II has a central bore I5 which opens through the upper contracted end I6 of the body and also downwardly through the reduced extension I2. The body I I has a large diameter trans verse bore Il' which opens through opposed sides of said body as clearly seen in Fig. 1 and in which the tool keying jaws I8 and I9 are mounted. Inner ends of these jaws are adapted to engage the inner square end of the tool I4 to definitely key the tool I4 against rotation in the chuck body, it being understood that the tool is also gripped by the jaws actuated by the sleeve I3 as in other devices of this type and kind. At right angles to the bore I! the body II has opposed apertures, one of which is seen at 2I in Fig. 1 of the drawing. The apertures 2I open into the bore I! at the lower portion thereof so as to give vision to the inner square end 20 of the tool.

Eccentrically disposed in the jaws I8 and I9 is a jaw operating screw 22 having left and right threaded end portions 23 and 24 engaging correspondingly threaded bores 25 and 26 of the jaws I8 and I9. By disposing the screw 22 eccentrically in the jaws, or in other words nearer the upper portions thereof than the lower portions, relatively thick gripping surfaces 21 and 28 are provided on the jaws I8 and I9 for engagement with the square end 20. The threaded ends 23 and 24 are joined by a reduced bridging portion 29 which allows the square end 20 to extend a reasonably long distance into the bore IT. The ends of the screw 22 have similar rectangular sockets 30 and 3| to receive a tool for rotating the screw in moving the jaws I8 and I9 into operative and inoperative positions. By providing these sockets at both ends of the screw a more balanced condition of the entire chuck device is provided with respect to distribution of weight which avoids vibration in high speed operation of the chuck device.

Considering now Fig. 2 of the drawing here a view of the jaws l8 and I 9 is shown detached with respect to the chuck body II with the section taken through the retaining member or element 32 which is employed to prevent displacement of the jaws I8 and I9 from the chuck body II as well as to key the jaws against rotation in the bore IT. The member or element 32 comprises a disc 33, note Fig. 1, which fits snugly in the lower portion of the bore I5. The lower surface of the disc has a transverse key bar 34, the bar having ends 35 protruding beyond the disc 33, thus retaining the element 32 in the lower portion of the bore I5. The bar 34 operates in key recesses 36 and 31 in the jaws I8 and I9.

These key recesses being sufficiently long to facilitate movement of the jaws into close position with respect to each other to engage the square end of a relatively small diameter tool as well as to the extent to engage square ends of tools of large diameters within the capacity of the chuck.

From the foregoing; it will be; apparent-that while the jaws Wand 19 are free to move longitudinally of the key bar 34 they are checked in this movement by engaging the ends 35. In at? taching and detaching the-elementor. member. 32 the jaws I8 and is are extended to a position facilitating removal thereon from the; bore I15.

and when the same, including-'the-screw 22 have been removed the member or element 32 can be removed from or inserted iIllJQ; thebore I?! for. positioning in the bore l5. By using the retaining and keying element 32 a practical baianced condition is provided inithe chuck devices with respectto weight. displacen'ient, and this is ad:- vant'ageous particularly, with. chuck devicesoperated at highspeeds.

Having fully; described. my invention, what. I claim as new and desire.- to.- secure; by. Letters Patentis:

1;. A chuck. device comprising a, tubular. chuck body, a pair. of tool engaging. jaw; members mounted'in and'mova'ble axially. of a transverse bore in saidbody, a left and-right. hand. screw element in threaded engagement withsaid jaws for movingsaidjaws toward and from eachother in' gripping and. releasing. a: tool, said. jaws have ing alined keyzgrooves in the outer surface thereof and communicating at adjacent. surfacesof the jaws, the upper portionof saidbody having a tapered bore, communicating. with. said: trans: verse bore, a-keyelement, said. key, element. having a, disc portionarrangedlin. the. tapered. bore of: said body, .andsaidelementhavinga key bar arranged in. said transverse. bore and: operating in the. key. grooves of saidjawstokey-the .iaws

' against. rotation in saidlbody,

2,. Achuck device comprisingv a tubulanchuck body, av pair of tool engaging Jaw. members mountedin andimovable axially ofia.transverse bore. in ,saidbodj aleft'. hand and right hand screw element in .threadedengagement' with said jaws .formoring. said jaws toward and .fromeach other in gripping and releasing a tool; said; jaws havingalined key grooves. in the outer. surface thereof.andcommunicatingiat adjacent surfaces of the jaws, the upper. portion ofsaidbodjz having a tapered bore communicating with said transverse bore, a key elementsaid key element having a disc portion arrangediin the tapered bore of'said'body, said'elemen't'havinga key bar arranged in said transverse ,bore'andioperating in the key grooves of said jaws to key the jaws against rotation in said'body, and said body having another transverse. bore at right angles; to thefirst bore in alinement with lower. adjacent portions of saidjaws to render engagementoffthe jaws witha tool visible.-

3: A chuck device-comprising a tubular chuck body, a pair of toolengaging jawmembers mounted in and movable axiaily of a" transverse boreinsaid' body, a left andright hand screw elementirrthreaded engagementwith said" jaws for moving said jaws tow-ardand from-each other in gripping and releasing a tool, said'jaws having alined'key grooves in the outer surface. thereof and communicating ata'djacentsurfaces of the jaws the upper portion offsaidibody, l'iaving a tapered bore communicating ,with said transverse 4 bore, a key element, said key element having a disc portion arranged in the tapered bore of said body, said element having a key bar arranged in said transverse bore and operating in the key grooves of said jaws to key the jaws against rotation in said body, said body having another transverse bore at right angles to the firstboreeinalinement' with lower adjacent portions of said' jaws torender engagement of the jaws with a tool visible, and the ends of said screw element having similar key sockets.

4,.A chuck. device comprising a. tubular chuck body, a pair of tool engaging jaw members mcuntedzinmnd movable axially of a transverse bore in. said: body; a left and right hand screw elementiir threaded engagement with said jaws fon movingsaidgjaws toward and from each other in gripping and releasing a tool, said jaws having-'alinedikey grooves in the outer surface thereof and communicating; at adjacent surfaces of the=jaws, the upper-r portion of said body having atapered. bore. communicating; with said transverse. bore, a: key element, .said key; element. hav.- a-disc portionarranged inthe tapered'bore of said body, said element having, akey-bararranged in said, transverse. bore and. operating inthekey, groovesof. said jawstdkey. the jaws against rotation. in, said body, and. said: screwelement being. eccentrically. disposed. in. said jaws to provide. wide. gripper. surfaces. at, lower. por tions. thereof.

5. A. chuck. device. comprising, a tubular. chuck body, a. pain of tool. engaging, jaw. members, mounted inandmovable axially of a. transverse borein. said. body, aleft' and right hand. screw element in threaded engagementwith. said jaws for. moving: said jaws. toward. and. from each other in gripping and'releasing,a too1;.said;jaws having alined. key-grooves in the. outer. surface thereof and communicating at adjacent.v surfaces of thejaws, the upper portion of saidbody having a tapered bore communicating with said transverse bore, a .key, element, said. key element having adisc portion arranged in the tapered bore of said body, said. elementhaving a key bar-arranged injsaid. transverse. bore. and operating in thekey rooves. ofsaid jaws: to key the :jaws against rotationjn saidbo'dy, saictiscrew element 'being eccentricallydisposed'in" said jaws to provide wide: grippersurfa'ces. at lower portionsthereof, said screw-element-havinga centrally reduced shank; andthe key'bar being'of greater length than the diameter ofsaiddisc portion; and the-axis'of said sorewelement-being offset upwardly with" respect to the axis" of said jawsto providedeepgrippersurfaces at lower; adjacent portions of said'jaws;

6. A chuck device-comprisinga' tubular chuck body-apair-of'tool engagingjaw members mounted in and movableaxially of a transverse bore in said body, a left and right hand screw element' in threaded engagement with said jaws for moving said jaws toward and from each other in gripping" and releasing a tool, saidjaws-haw ing alined key-grooves in the outer surface'thereof and communicating at adjacent surfaces of the jaws; the upperportion. of said body having a tapered bore communicating with: said transverse-bore, a keyrelement; said keyrelement having a disc portion arranged-inane tapered bore of said b'ody, said elementhaving akeybar arranged in said transverse bore and operating in thekeygrooves of saidjawsto-key-thejaws against rotation in saidbody; said screw-element beinggeccentrically disposed in saidjaws to provide wide gripper surfaces at lower portions thereof, said screw element having a centrally reduced shank, the key bar being of greater length than the diameter of said disc portion, in the axis of said screw element being oiiset upwardly with respect to the axis of said jaws to provide deep gripper surfaces at lower adjacent portions of said jaws, and the outer end portions of the screw element having common square sockets.

7. A chuck device of the character described comprising a chuck body, a pair of jaws mounted for movement transversally of said body, means for feeding the jaws toward and from each other, to move said jaws into operative and inoperative positions, means completely housed and concealed within the chuck body engaging said jaws to key jaws against rotation in said body, and said last named means comprising a key element having a part keyed within the chuck body and a key bar operating in alined key grooves on adjacent portions of said jaws.

8. A chuck device of the character described comprising a chuck body, a pair of jaws mounted for movement transversally of said body, means for feeding the jaws toward and from each other, to move said jaws into operative and inoperative positions, means completely housed and concealed within the chuck body engaging said jaws to key jaws against rotation in said body, said last named means comprising a key element having a portion engaging the chuck body to aline the element in said body, and said element having a portion engaging both of said jaws.

9. A chuck device of the character described comprising a chuck body, a pair of jaws mounted for movement transversally of said body, means for feeding the jaws toward and from each other,

to move said jaws into operative and inoperative positions, means completely housed and concealed Within the chuck body engaging said jaws to key jaws against rotation in said body, said last named means comprising a key element having a portion engaging the chuck body to aline the element in said body, said element having a portion engaging both of said jaws, said first named means comprising a left and right hand screw having common socket ends, and the common socket ends of said screw and central location of the key element in said body establishing a balanced arrangement of parts in said chuck body.

10. In chuck devices comprising a body having a pair of tool engaging jaws movable transversely of said body, a key element for keying said jaws against rotation in said body, said element comprising a disc portion engagin the chuck body for centralized alinement within and retention against radial movement, an elongated key bar projectingcentrally from one surface of the disc portion and having ends protruding beyond the periphery of the disc portion, and said bar engaging both of said jaws in keying the jaws in said body.

LOUIS IRRGANG.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,775,992 Emrick Sept. 16, 1930 1,873,476 Procunier Aug. 23, 1932 2,159,162 Johnson May 23, 1939 2,237,875 Brown Apr. 8, 1941 

